Machine for grinding valves



F. $.SEMFSON MACHINE FOR GRINDING VALVES June 7, 192? 1,63%?90 File J y 25, 1924 2 Sheets-Sheet 1 June 9, 1927. 1,631,700

F. s, SiMPSON MACHINE FOR GRINDING VALVES Filed July 1924 2 Sheets-Sfieet 2 7 I J 1? 1 J I 6 I "llllllllllflfllll Ill". J

Patented June 7, 1927..

NITED STATES FRANKLIN S. SIMPSON, OF ALTON, ILLINOIS.

MACHINE FOR GRINDING VALVES.

Application filed July 23,

This invention relates to a machine for grinding valves of internal combustion en gines.

The object of the invention is the provision of a machine of this character having means for automatically turning, elevating, and depressing the valve being ground, with adaptability for effecting adjustments whereby the aforesaid operations may be timed as may be desired, and a grinding effected which will be superior to hand grinding.

The device or machine is illustrated as adapted for operation by hand, but it is intended for use as a power driven machine, if desired, and in that event it is only necessary to includereducing gears for cutting down the number of revolutions of the motor or power machine used as a drive.

The invention is set forth as adapted for simultaneous grinding of two valves but it will be understood that the mechanisms used are substantial duplicates and that the principle of the invention is involved in only one of the mechanisms.

I am aware that the mechanism which carries out the principle of my invention is susceptible of modification without depart-- ing from the principle itself and modifications, within the spirit and scope of the invention, are to be included within the claims forming a part hereof.

In the accoi'npauying drawings Figure 1 is a partly sectional, partly elevational vie-w,

Figure 2 is a plan view, partly broken away,

Figure 3 is an end elevation,

Figure 4 is a detail view of the fulcrum adjusting or setting means, and

Figures 5, 6, 7, 8 are detail views of certain bearings.

The frame which carries the operative mechanisms is shown at 1, said frame being adapted to be held to the engine by bolts 2, passing through slots 2 in the frame 1, so that the valve grinding mechanism will be properly centered or related to the valve or valves to be ground. Two of the engine valves appear at 3, springs 4 being provided to elevate the valves from their seats when downward pressure of the mechanism thereon is released.

The frame 1 is provided with cross pieces 5, 6, the lower one being suitably secured to frame 1 and the upper one having its 1924. Serial N0. 727,729.

ends passing through slots in the frame and clamped by set screws 7, thus providing for detachability.

The cross pieces 5, 6, are provided with elongated slots 5, 6 in which are slidably mounted spindles 8, 9. Slides 8, 9 which are movablv mounted in the slots 5, 6', respectively, serve as bearings for the spindies 8, 9. The upper slides 8 are coupled by a right-and-left-hand adjusting screw 8 by which the spindles 8, 9 may be set closer or farther apart, as desired, to align them with the valves 3, inasmuch as engine valves are set at different distances apart in different engines.

Each spindle has a coarse screw or spiral 10 to the lower end of which is pinned a cap 11 having studs 12 for engaging the recesses in the valve 3, so that the valve may be turned when the cap 11 is turned by the rotation of the spindle and its screw or spiral 10. The cap 11 being removable, it is possible to attach a cap suited to the valve which is being ground.

The spindles 8, 9, are provided with collars 13 having pins 14. Interposed between the collars 18 and an. adjustable head or collar 15 on the spindles 8, 9, is a coil spring 16 which forms a cushion between the collar 13 and the collar 15 to cushion the pressure exerted on the spindles 8, 9, and spiral 10, as will now appear.

Fulcrumed on rod 17 is an operating lever 18 which has a slotted yoke or fork 19 engaged with the pins 14.

The driving shaft 20 which is j ournaled in the frame 1, carries the eccentrics 21 whose straps appear at 22 and 23, said straps, respectively, operating the levers 18 so that both spindles 8, 9, are actuated from the same shaft 20 although the mechanisms or units for the two valves which are to be ground, are independent, and, as will now appear, are susceptible of independent adjustment.

Each eccentric 21 is adapted for setting, as desired, by the provision of an adjustable connection between it and the shaft 20. The eccentric is provided with an arcshaped slot 24 through which passes a squared part of shaft 20. An arm 25 which is pivoted at 26 to the eccentric 21, embraces the squared part of the shaft 20 and is secured thereto by a set screw 27. The arm 25 has a rack 28 which is engaged with a worm 29 mounted in bearings 30 projecting from the face of the eccentric 21. By turning the worm, the rack 28 is fed upwardly or downwardly and thus the setting of the eccentric is determined at will. The worm and rack being self-locking, the eccentric will remain Where set.

A nut or collar 31 is mounted on the spiral 10, in each instance. The nut or collar has a slot which loosely embraces the spiral; consequently the spiral will turn when the nut 31 is moved up and down.

An arm 32 which is secured to the eccentric strap 22 at 33 is adjustably fulcrumed. This arm is provided with a fork 34 having slots 35 which receive pins 36 on the collar 31.

The adjustable fulcrum for the arm 32 comprises a rocker 37 which is rockably mounted on a shelf or bearing, pillar or the like, 33 of frame 1. A. shaft 39, suitably mounted in frame 1, carries the rocker 37 and passes through a slot 40 in the arm 32. Secured to the shaft 39 is an arm 41 of spring steel which has a suitable handle 42 and is provided with an aperture 43 adapted to be made to receive any one of a plurality of pins 44 carried by the frame 1. By swinging the arm 41 and engaging it with any desired pin 44, the rocker 37 is rocked 011 its support 38 and, by the shifting of the shaft 39 in slot 40, the fulcrum for arm 32 is changed.

Thus, such adjustment may be had of the nut 31 as may be required for the various positions to which the valve 3 will be ground.

While I have shown and described a sepa rate shaft 39, rocker 37 and handle 42 so that independent adjustments of the fulcrums for the arms 32 may be obtained, it is not essential that such separate adjusting mechanism be provided.

The shafts 39 may be combined into a single, continuous, shaft and only two rockers 37 employed and but a single arm 41 and locking means therefor, need be used in that event.

Furthermore, the rocker 37 may be made as a complete disc and will still have a camlike action. If thus constructed, adjustment can be effected by turning in only one direction, instead of backwardly and forwardly.

Each spindle 8, 9 is provided with a pin 45 with which the collar 13 engages when it rises. After the collar .13 engages the pin 45, the spring 16 loses its effectiveness and permits the weaker spring 4 to act.

The adjusting or setting mechanism for the eccentric, comprising the parts 25, 28, 29, etc., is not essential as the eccentric 21. may be fixed on the shaft 20, but this adj usting or setting mechanism enables a fine adjustment to be obtained and is, therefore, desirable.

During the revolution of shaft 20, the eccentric 21 causes its strap to elevate the left hand end of the lever 18 and to force down the collar 13. The motion is connnunicated through spring 16 to collar 15, causing the spiral 10 to be lowered. This forces the valve 3 onto its seat, and, at the same time, the spiral turns, due to its engagement with the nut 31 which effects the desired grinding of the valve. The movement of the nut 31, as the eccentric rotates, causes the spiral 10 to move alternately in a clockwise and counterclockwise direction, so that the oscillating movement required for valve grinding, is provided. Vfhen the eccentric releases the lever 18, the left hand end of the lever is pressed down by the action of spring 16 and the spindle 8 and spiral 10 are elevated by the action of spring 4 when the collar 13 engages pin 45.

What I claim is:

1. In a valve grinding machine, the combi nation with a spindle, of means for reciprocating said spindle longitudinally and for rotating it, comprising an eccentric the throw of which both reciprocates and rotates said spindle.

2. In a machine for grinding valves, the combination with a longitudinally reciprocatable and rotatable member adapted to cooperate with the valve to be ground, of an eccentric, a lever operated by said eccentric, a collar slidable on the reoiprocatable and rotatable member, a spring cushion carried by the reciprocatable and rotatable member and constituting a support for said collar, said lever cooperating with the collar in opposition to said spring cushion, and addi tional means operated by the throw of the eccentric adapted for rotating the said reciprocatable and rotatable member.

3. In a machine for grinding valves, the combination with a reciprocatable and rotatable member adapted to cooperate with the valve being ground, of an eccentric, an arm operated by said eccentric which has an ad justable or variable fulcrum, and means operated by said arm for oscillating the reciprocatable and rotatable member.

4. In a machine for grinding valves, the combination with a reciprocatable and rotatable member adapted to cooperate with the valve being ground, of an eccentric, an arm operated by said eccentric, means controlled by the arm for oscillating the reciprocatable and rotatable member, and a rocker adapted to be rocked to dilferent positions and retained where set, said rocker adjustably fulcruming the arm.

5. In a machine for grinding valves, the combination with a reciprocatable and rotatable member adapted to co-operate with the valve being ground, of an eccentric carrier, an eccentric having an adjustable or setable mounting on said carrier whereby the throw of the eccentric may be varied, an arm operated by said eccentric which has an adjustable or variable fulcrum, and means moved by said arm for turning the reciprocatable and rotatable member.

6. In a machine for grinding valves, the combination with a longitudinally reciprocatable and rotatable spindle having a spiral or coarse screw thread and provided with means for engaging the valve being ground, of means operable in one direction for shifting said spindle and spiral to press the valve onto its seat, the valve spring serving to lift the valve when the valve is released, and means on' the spindle which is engageable by the shifting means when the latter is moved in the opposite direction for the purpose of raising the shifting means to permit the valve spring to lift the valve, and means independent of the shifting means and engaged with the spiral for turning it.

7 In a machine for grinding valves, the

combination with a longitudinally reciprocable and rotatable spindle having a spiral or coarse screw thread and provided with means for engaging the valve being ground, of a spring cushion carried by the reciprocable and rotatable spindle, means operable in one direction to act on said spring cushion for shifting said spindle and spiral to press the valve onto its seat, the valve spring serving to lift the valve when the valve is released, means'on the spindle which is engageable by the shifting means when the latter is moved in the opposite direction for the purpose of raising the shifting means to permit the valve spring to lift the valve, and means engaged with the spiral for turning it.

In testimony whereof I aflix my signature.

FRANKLIN S. SIMPSON. 

